Climatological Report (Monthly)
Issued by NWS

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424
CXUS56 KSEW 011049
CLMSEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
349 AM PDT TUE MAY 1 2018

...................................

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              89   04/18/2016
 LOW               29   04/05/1975
                        04/01/1953
                        04/07/1952
HIGHEST            82   04/26        MM      MM       66  04/21
                                                          04/16
LOWEST             36   04/02        MM      MM       38  04/11
AVG. MAXIMUM     58.6              58.5     0.1     57.3
AVG. MINIMUM     44.1              42.2     1.9     44.0
MEAN             51.3              50.3     1.0     50.6
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         6.53   1991
 MINIMUM         0.33   1956
TOTALS           5.69              2.71    2.98     4.21
DAILY AVG.       0.19              0.09    0.10     0.14
DAYS >= .01        16              14.3     1.7       23
DAYS >= .10        12               7.5     4.5       10
DAYS >= .50         4               1.3     2.7        1
DAYS >= 1.00        1               0.2     0.8        0
GREATEST
 24 HR. TOTAL    1.70   04/14 TO 04/14

SNOWFALL (INCHES)
RECORDS
 TOTAL            2.3   1972
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         4.0               6.8    -2.8     11.2
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0                                  0
GREATEST
 SNOW DEPTH         0   MM                             0
 24 HR TOTAL      0.0   04/30 TO 04/30               0.0

DEGREE_DAYS
HEATING TOTAL     406               440     -34      424
 SINCE 7/1       4011              4268    -257     4177
COOLING TOTAL       2                 0       2        0
 SINCE 1/1          2                 0       2        0
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
HIGHEST WIND SPEED/DIRECTION    28/220    DATE  04/17
HIGHEST GUST SPEED/DIRECTION    38/220    DATE  04/11

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR            2
NUMBER OF DAYS PC              8
NUMBER OF DAYS CLOUDY         20

AVERAGE RH (PERCENT)     70

WEATHER CONDITIONS. NUMBER OF DAYS WITH
  0
  3
  0
  0
  0
  0
  1
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$



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